Engine 2014: Motor Plants and Auxiliary Boilers

1. A Control the amount of lube oil burned in the combustion chamber.
2. B Transmit heat from the piston to the cylinder liner.
3. C Prevent damage to ring groove inserts by acting as a heat dam.
4. D Dissipate combustion chamber gas pressure by channeling it  through the ring gap.

Tip: press A-D to answer